crossfire/node/packages/contracts/src/schema/controller.ts

function metadata(input: unknown): Result<Record<string, string>> {
    if (!input || typeof input !== 'object' || Array.isArray(input) || Object.keys(input).length > 16)
        return failure('invalid', 'Controller metadata supports at most 16 text fields');
    const output: Record<string, string> = {};
    for (const [key, value] of Object.entries(input)) {
        if (!/^[a-z][a-z0-9-]{0,39}$/u.test(key) || !check.text(256, 0)(value).ok || typeof value !== 'string')
            return failure('invalid', 'Invalid controller metadata');
        output[key] = value;
    }
    return success(output);
}

controller = check.object({ name: check.text(100), metadata: check.optional(metadata) })